package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    //微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatProperties weChatProperties;

    @Override
    public User login(UserLoginDTO dto) {
        // 通过HttpClient，构造登录凭证校验请求
        // 构造请求参数
        Map<String, String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",dto.getCode());
        map.put("grant_type","authorization_code");
        String res = HttpClientUtil.doGet(WX_LOGIN, map);
        log.info("res={}",res);

        // 解析响应结果，获取openid
        JSONObject jsonObject = JSON.parseObject(res);
        String openid = (String) jsonObject.get("openid");

        //判断openid是否为空，如果为空表示登录失败，抛出业务异常
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        // 判断是否为新用户，根据openid查询user表
        User user = userMapper.getByOpenId(openid);

        // 如果是新用户,初始化用户数据到user表中
        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        // 否则返回user对象数据
        return user;

    }
}
